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from a small number of suppliers, principally Alcatel-Lucent, Cisco Systems, Comverse, Ericsson, Huawei andSiemens Networks, although some of the equipment that we use is available from other suppliers. From time totime, we have experienced delays receiving equipment. Our business could be materially adversely affected if weare unable to obtain adequate supplies or equipment from our suppliers in a timely manner and on reasonable terms.Our business depends on providing customers with reliability, capacity and security. As telecommunicationsincreases in technological capacity, it may become increasingly subject to computer viruses and other disruptions.We cannot be sure that our network system will not be the target of a virus or, if it is, that we will be able to maintainthe integrity of the data of our corporate customers or of that in individual handsets of our mobile subscribers or thata virus will not overload our network, causing significant harm to our operations. In addition to computer viruses,the services we provide may be subject to disruptions resulting from numerous other factors, including human error,security breaches, equipment defects, and natural disasters, which could have a material adverse effect on ourbusiness.Problems with our backbone, switches, controllers, fiber optic network or network nodes at one or more ofour base stations, whether or not within our control, could result in service interruptions or significant damage to ournetworks. All of our equipment for provision of mobile services in Moscow is located primarily in two buildings inMoscow. Disruption to the operation of these buildings such as from electricity outages or damage to these buildingscould result in disruption of our mobile services in Moscow.We store our data center and fixed-line network equipment at state-owned premises in Moscow pursuant toan agreement with the Russian authorities. The State Property Committee has filed two lawsuits seeking to evict usfrom the premises, alleging that the lease agreement was entered into without the consent of the State PropertyCommittee. One of these lawsuits has been dismissed, but may be appealed. Management believes that the risk of anadverse outcome of these lawsuits is probable. As a result of these lawsuits, we may lose our right to continueoccupying the premises, and this could result in network disruption which could have a materially adverse affect onour business, financial condition and results of operations. For more information on these lawsuits, see “OurCompany—Legal Proceedings—Other Proceedings.”Although we have back-up capacity for our network management operations and maintenance systems,automatic transfer to our back-up capacity is not seamless, and may cause network service interruptions. In recentyears, we have experienced network service interruptions, which occur from time to time during installations of newsoftware. Interruptions of services could harm our business reputation and reduce the confidence of our subscribersand consequently impair our ability to obtain and retain subscribers and could lead to a violation of the terms of ourlicenses, each of which could materially adversely affect our business. We do not carry business interruptioninsurance to prevent against network disruptions.Our ability to manage our business successfully is contingent upon our ability to implement sufficientoperational resources systems and processes to support our rapid growth. We may face risks in connection with thecorrect use of the newly introduced systems and processes in the regions of Russia and the CIS or integrating newtechnologies into existing systems. For example, if our billing system develops unexpected limitations or problems,subscriber bills may not be generated promptly and/or correctly. This could materially adversely impact ourbusiness since we would not be able to collect promptly on subscriber balances.Our operations in the CIS and the operations of Golden Telecom employ billing and managementinformation systems which may not provide our management with information that is sufficient in amount oraccuracy. Golden Telecom is in the process of integrating its billing and management information systems, whichwill allow it to bill its customers and to manage other administrative tasks through a unified system. If GoldenTelecom is unable to integrate and upgrade its billing and management information systems to support its integratedoperations, its billing may be insufficient, which could have a material adverse effect on our revenues. Furthermore,Golden Telecom relies on agent billing and information systems to provide information necessary to generateinvoices in certain areas of its operations. Golden Telecom may encounter risks associated with verification andcalculation of volumes of long-distance services provided to end users, invoicing and revenue recognition.Sale of handsets and other devices and our inability to maintain relationships with handset providers couldhave a negative impact on our Company.Historically the vast majority of our revenue has come from providing telecommunications services, withrelatively little of our revenue coming from sales of handsets and other devices. In 2008 we significantly increased37